<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<title>canvas绘图</title>
</head>
<body>
	<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
		Your browser does not support the HTML5 canvas tag.
	</canvas>
	<script type="text/javascript">
		var c=document.getElementById("myCanvas");
		var ctx=c.getContext("2d");
		ctx.fillStyle="#0000ff";
		ctx.fillRect(20,20,150,100);//画的是实心的
		
	</script>
</body>
</html>